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What cities are suitable for asthma patients to live in?

Asthma is mostly caused by allergies, mainly dust mites, pollen, mold, indoor decoration, automobile exhaust, air pollution and so on. In order to prevent asthma attacks, we must go to cities with fresh air and less pollution.

Sanya, Dalian, Qingdao and other beautiful coastal cities in Hainan can do it. The best city in winter is Sanya.